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Consolidated Statements of Changes in Partners' Capital (Parentheticals) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Limited Partners Common      
Distributions declared and paid $ 0.94 $ 0.93 $ 0.93
Limited Partners Preferred      
Distributions declared and paid $ 0.87 $ 0.86 $ 0.86